Removable spring-abutment.



ERNEST E. WEMP, OF PONTIAC, MICHIGAN.

REMOVABLE SPRING-ABUTMENT.

Specication of Letters Patent.

Patented Feb. 13, 1911.7.

Application led December 13, 1915, Serial No. 66,436. Renewed January 5, 1917. Serial No. 140,704.

To all whom it may concern:

Be it known that I, ERNEST E. WEMP, a

' citizen of the United States, residing at Pontiac, county of Oakland, State of Michigan, have invented a certain new and useful Improvement in Removable Spring-Abutments, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which for'm a part of and is both adapted to centralize itself and centralize the spring.

In the drawings,-

Figure 1 is a vertical section of a portion of aninternal combustion engine adjacent the valve.

Fig. 2 is an end view of the valve stern showing how the'spring abutment is passed over the same in the process of putting it in place.

Fig. 3 shows a similar view with the spring abutment in place.

Fig. 4 is a detail of the .valve stem showing how the modified form of washer which is passed laterally on to the valve'stem looks when in place.

F ig..5 shows how this washer is placed.

Fig. 6 is an end view making asimilar showing.

Fig. 7 is a view of the washer provided with a double cupped portion to provide a spring seat fora spring of large diameter.

a indicates the valve stem of an internal ,combustion engine; l) the customary helical spring which serves to keepthe valve closed. The valve stem is provided with an annular groove c which forms a reduced lportion for the stem and which has at least one abrupt shoulder. which is shown Ain Figs. 1, 2 and 3 as lprovided wth a compound slot, that is to say,

' Washer.

d designates a cupped washer a central perforation adapted to lit around the'reduced portion of the valve stem and a large eccentric perforation communicating with the central perforation and which serves in the assembling of the washer upon the stem. The washerl is passed over the i Now an important feature of this inven-l tion is to have the cupped portion of the washer so that its internal diameter at the top of the dome-like cup or boss is just large enough to lit over the larger diameter ofthe stem so that this serves to centralize the Washer with respect to the stem when the spring pressure is exerted in the washer. The external diameter .of the cupped `portion at the bottom ofthe dome by the natural enlargement of the dome toward its base is calculated so as to accord with the internal diameter of the coils of the'spring, thereby centralizing the spring upon the In case a larger spring is used than is possible to make the externall diameter of the cup in the natural development of the dome-like boss from that portion of the top that fits over the large portion lof the stem at the shoulder, then a spring seat is pressed into the cupped washer such as shown in Fig. 7.

In Figs. t, 5 and 6 a similar cupped form of washer is shown in whichv the slot eX- tends from'the"outside edgeof the cupped washer to and beyond the center of the washer so that the washer may be assembled upon the stem in the manner shown by cornparing Figs. 6, 5 and 4.'

It will be seen that the pressure of the helical spring Z) serves to keep the washer in place in all these forms by reason of forcing the 'substance of the washer adjacent the restricted portion of the yslot against the abrupt shoulder connecting the -reduced portion of the valve stem with the portion of larger diameter. l

In Figs. 4, 5 and 6 I have shown a lateral extension .ortab e on the washer. This tab serves to indicate the direction in which the washer must be displaced-laterally to disassemble it from the stem. `It also serves as a .means for getting a hold on the Washer either by the ngers or with a pair of pliers.

tion upon the valve stem butlalso the means for both centralizing itself upon the valve stem and centralizing the spring. It is obvious that the Washer by reason of' its cup-like or dome-like character of the central portion may be stamped out.

What I claim is:

l. In a spring abutment, the combination of a stem, a spring coiled thereabout,- and a Washer finallyl assembled upon the said stem by lateral movement, said Washer be,- ing providedl With an extension or tab by which it may be disassembled from the stem by grasping the tab( and pulling laterallyv of the stem on said tab. 2. A spring abutment, having in combination With a stem provided With a. reduced and shouldered portion and a spring encircling the stem, a Washer constructed to form a central cup WhoseY interior diameter 1s calculated to just fit over the large portion of the stem so that the Washer centralizes itself and Whose eXterior and interior'gradually fiare so the cup just fits in the coils of the spring to centra-lize the spring, the said Washer being perforated at the center to fit around the reduced portion of the stem and having an eccentric opening communicating With the central perforation to permit of the assembling of the Washer upon the reduced portion of the stem, substantially as described.

3. A spring abutment, having in combina- -tion with a stem provided with a reduced and shouldered portion and a spring encircling the stem, a Washer cupped centrally to form a boss of dome-shape, the interior culated to just lit over' the largen portion of the 'stem so that the Washer centralizes -itself and the .dome-like boss enlarging toward its base so that the spring resting on the flat marginal portion of 'the Washer is centraliz'ed 'by the lower portion of the boss which is enlarged to just fit into the interior of the spring, the said Washer being perforated at the center to just lit around thereduced portion of the stem and having an eccentric opening communicating With the central perforation to permit of the assem- Abling of the Washer upon the reduced portion Vof the stem, substantially as described.

4. In al device for the purpose specilied, the combination of a stem provided With a reduced portion forminga shoulder, a coiled spring engaging thereabout, and a Washer constructed of metal of substantially uniform thickness and having a central a-perture, the bordering vmetal for which fits around the reduced' portion of the stem and lies against the said shoulder, said Washer having an eccentric opening merging into the central opening by Which the Washer can be assembled upon the stem bylateral movement to a concentric relation with respect to the stem, the said Washer having its central portion cupped to provide a dome Whose interior diameter near the top of the dome just lits over the outside of said shoulder to centr'alize `the Washer o-n the stem andthe dome enlarging in diameter toward of the top of the dome-like boss being .cal-

its base Where it merges with the outside portions of the Washer to form an annular flange acting as a seat for said coiled spring, the size of the base of the dome being calculated to just fit into the coiled spring to centralize the same. f

In testimony whereof I signthis specilication. v

ERNEST E. WEMP. :v 

